HDDS-1346. Remove hard-coded version ozone-0.5.0 from ReadMe of ozone…

[xiaoyuyao]

…secure-mr docker-compose. Contributed by Xiaoyu Yao.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	52	Docker mode activated.
		_ Prechecks _
+1	@author	0	The patch does not contain any @author tags.
		_ trunk Compile Tests _
+1	mvninstall	1273	trunk passed
+1	mvnsite	73	trunk passed
+1	shadedclient	2119	branch has no errors when building and testing our client artifacts.
		_ Patch Compile Tests _
-1	mvninstall	22	dist in the patch failed.
+1	mvnsite	23	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	shadedclient	868	patch has no errors when building and testing our client artifacts.
		_ Other Tests _
+1	asflicense	27	The patch does not generate ASF License warnings.
		3228

Subsystem	Report/Notes
Docker	Client=17.05.0-ce Server=17.05.0-ce base: https://builds.apache.org/job/hadoop-multibranch/job/PR-652/1/artifact/out/Dockerfile
GITHUB PR	#652
Optional Tests	dupname asflicense mvnsite
uname	Linux 0eda072a74c9 3.13.0-153-generic #203-Ubuntu SMP Thu Jun 14 08:52:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / 9cd6619
maven	version: Apache Maven 3.3.9
mvninstall	https://builds.apache.org/job/hadoop-multibranch/job/PR-652/1/artifact/out/patch-mvninstall-hadoop-ozone_dist.txt
Max. process+thread count	305 (vs. ulimit of 5500)
modules	C: hadoop-ozone/dist U: hadoop-ozone/dist
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-652/1/console
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